Non-Adiabatic Effects on Electron Beam Quality for Frequency-Tunable Gyrotrons

We propose an unconventional electron gun structure in which the emitter is located on a concave cathode surface with a non-uniform electric field. Such a design violates the intuition that an emitter should place close to a uniform electric field to reduce the velocity spread. The commonly employed design guide based on the adiabatic condition predicts a huge velocity spread of 24%, but the simulation using EGUN code and verified with CST particle studio shows a very low spread of 2.8%. Examining the magnetic moment and the kinetic energy of the beam reveals that the electrons experience a relatively long acceleration process due to the much weak electric field. That's why the non-adiabatic effect matters. In addition to the cyclotron compression and the E$\times$B drift, the "resonant" polarization drift plays a crucial role in reducing the overall velocity spread.Simulations show a decent beam quality with the pitch factor of 1.5 and the transverse velocity spread of 2.8% over a wide range of the magnetic field (7.4-8.0 T) and the beam voltage (12-22 kV) with a high structural tolerance. The promising results with the wide working range enable the development of continuous frequency-tunable gyrotrons.Comment: 5 pages, 5 figures, and 2 table

Inundation simulation for urban drainage basin with storm sewer system

Copyright © 2000 Elsevier. NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Hydrology . Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Hydrology Vol. 234 (2000), DOI: 10.1016/S0022-1694(00)00237-7An urban inundation model, combining a storm sewer model SWMM, two-dimensional (2D) diffusive overland-flow model and operations of pumping stations, has been developed to simulate inundation in urban areas caused by the surcharge of storm sewers and outlet pumping stations. The movement of water in the studied urban watershed is characterized by two components, namely, the storm sewer flow component and the surcharge-induced inundation component. SWMM is employed to solve the storm sewer flow component and to provide the surcharged flow hydrographs for surface runoff exceeding the capacity of the storm sewers. The 2D diffusive overland-flow model considering the non-inertia equation with Alternative Direction Explicit numerical scheme is then used to calculate the detailed inundation zones and depths due to the surcharged water on overland surface. Drainage by pumping stations at outlets of the storm sewer system has also been taken into consideration. The parameters of the model are calibrated and verified for discrete storms. The combined model is suitable for analysis of inundation on urban areas due to overflow of storm sewers and flooding caused by failure of pumping stations. Simulated results can be applied to establish flood-mitigation measures

Applying a Heuristic Approach for a Minimum-cost Operating Strategy for Tap Water

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchive

A New Design for Low Impact Development in Urban Area- Infiltration Pipe and Gravel Pile

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchive

INTEGRATING TRA AND TOE FRAMEWORKS FOR CLOUD ERP SWITCHING INTENTION BY TAIWANESE COMPANY

ERP systems had played an important role in Taiwanese industry in the past. Nowadays, most of companies have already install traditional type of ERP. However, with the development of cloud computing recently, the scope of applying cloud computing have been gradually expanded to the enterprise information system, such as cloud CRM provided by Salesforce.com, Business by Design provided by SAP. The model in this study is based on TOE model combination of Theory of Reasoned Action(TRA). We try to develop a model and utilize this model to defines critical effect factors to company’s intention of switching to cloud ERP from traditional type of ERP. This study used quantitative research methods and survey questionnaire, dates were collected from the 283 employees in Taiwanese company whose companies have already install traditional type of ERP and for cloud ERP have a certain understanding. This research has adopted SPSS and AMOS to analyse the reliability and validity. Last, structural equation model (SEM) for the data analysis to investigate the causalities among all parameters constructed in the proposed model. The results of this study were summarized as follows： The attitude of switching to cloud ERP positively impacted the intention of switching to cloud ERP, system quality positively impacted the attitude of switching to cloud ERP, financial benefit positively impacted the attitude of switching to cloud ERP, the trust factor positively impacted the attitude of switching to cloud ERP, industries pressure positively impacted the intention of switching to cloud ERP, surprisingly, government support is not perceived significant impacted the intention of switching to cloud ERP. This study provides a well criteria for cloud ERP vender, not only system design but also system sales. In addition, business user can also utilize this criterion

EFFECT OF NON-ELASTIC WHITE TAPE AND KINESIO TAPE ON FOOT PRESSURE DURING LEVEL WALKING

INTRODUCTION: Taping has been widely used for athletic trainers to re-build the longitudinal arch and to relieve the tension of plantar fascia. It is important to know how efficient the tapes are in supporting the foot’s longitudinal arches for the athletes. Therefore, the purpose of this study was to investigate the effect of non-elastic white tape and kinesio tape on foot pressure during level walking

EFFECT OF NON-ELASTIC WHITE TAPE AND KINESIO TAPE ON FOOT PRESSURE DURING LEVEL WALKING

INTRODUCTION: Taping has been widely used for athletic trainers to re-build the longitudinal arch and to relieve the tension of plantar fascia. It is important to know how efficient the tapes are in supporting the foot’s longitudinal arches for the athletes. Therefore, the purpose of this study was to investigate the effect of non-elastic white tape and kinesio tape on foot pressure during level walking

A Highly Sensitive Underwater Video System for Use in Turbid Aquaculture Ponds

The turbid, low-light waters characteristic of aquaculture ponds have made it difficult or impossible for previous video cameras to provide clear imagery of the ponds\u27 benthic habitat. We developed a highly sensitive, underwater video system (UVS) for this particular application and tested it in shrimp ponds having turbidities typical of those in southern Taiwan. The system\u27s high-quality video stream and images, together with its camera capacity (up to nine cameras), permit in situ observations of shrimp feeding behavior, shrimp size and internal anatomy, and organic matter residues on pond sediments. The UVS can operate continuously and be focused remotely, a convenience to shrimp farmers. The observations possible with the UVS provide aquaculturists with information critical to provision of feed with minimal waste; determining whether the accumulation of organic-matter residues dictates exchange of pond water; and management decisions concerning shrimp health

Supported Zinc Oxide Photocatalyst for Decolorization and Mineralization of Orange G Dye Wastewater under UV365 Irradiation

To solve the environmental challenge of textile wastewater, a UV/ZnO photocatalytic system was proposed. The objective of this study was to prepare a photocatalytic system by utilizing both cold cathode fluorescent light (CCFL) UV irradiation and steel mesh supported ZnO nanoparticles in a closed reactor for the degradation of azo dye C.I. Orange G (OG). Various operating parameters such as reaction time, preparation temperature, mixing speed, ZnO dosage, UV intensity, pH, initial dye concentration, and service duration were studied. Results presented efficient color and total organic carbon (TOC) removal of the OG azo dye by the designed photocatalytic system. The optimal ZnO dosage for color removal was 60 g m−2. An alkaline pH of 11.0 was sufficient for photocatalytic decolorization and mineralization. The rate of color removal decreased with the increase in the initial dye concentration. However, the rate of color removal increased with the increase in the UV intensity. The steel mesh supported ZnO can be used repeatedly over 10 times without losing the color removal efficiency for 120 min reaction time. Results of Fourier transform infrared (FTIR) and ion chromatography (IC) indicated the breakage of N=N bonds and formation of sulfate, nitrate, and nitrite as the major and minor products. The observation indicated degradation of dye molecules